21144140342 has 16 divisors (see below), whose sum is σ = 34950244560. Its totient is φ = 9531883872.

The previous prime is 21144140317. The next prime is 21144140377. The reversal of 21144140342 is 24304144112.

It is a super-4 number, since 4×21144140342⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9455117 + ... + 9457352.

It is an arithmetic number, because the mean of its divisors is an integer number (2184390285).

Almost surely, 2^21144140342 is an apocalyptic number.

21144140342 is a deficient number, since it is larger than the sum of its proper divisors (13806104218).

21144140342 is a wasteful number, since it uses less digits than its factorization.

21144140342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18912527.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21144140342 its reverse (24304144112), we get a palindrome (45448284454).

The spelling of 21144140342 in words is "twenty-one billion, one hundred forty-four million, one hundred forty thousand, three hundred forty-two".